Fleas bite and could produce disease to people.
Sand fleas are small creatures which live on beaches and feed on tidal litter. They are unrelated to human fleas and would not survive for very long on the human body or in human clothes. They are only named sand "fleas" because they jump.
Yes they do.
Sand Fleas don't have to brain power to make a rocket to make a successive moon landing...
maybe
No, fleas will live in your home and bite people instead. Your home will need to be treated for fleas if a fleas are seen!
The rats were infected with fleas. The fleas were infected with diseases that were transmitted to people by thr bite of the flea.
Wash your hair!
sand fleas
yes, they bite anything with hair/fur. lice on the other hand bite only people.
Fleas do not bite in the sense that they have no jaws or teeth. Instead, they have a highly developed set of mouth parts which act like a syringe needle. When flees bite, they actually drill through the skin to get to a blood vessel to drain blood from it.
You could go to a doctor.